Understanding Position Sizing: More Than Just Bet Big

Position sizing is crucial, yet often oversimplified. It's not about how much capital you can put into a trade, but rather how much you should based on your risk tolerance and the trade's volatility. A common mistake is using a fixed dollar amount for every trade, regardless of the underlying asset's movement or stop-loss distance. For instance, risking the same fixed sum on a volatile stock like $NFLX (which today saw a range of $74.02–$75.48) as you would on a comparatively stable $BAC (range $58.41–$59.43) for the same percentage drop on your stop means taking on disproportionately higher actual dollar risk with $NFLX. Instead, define your maximum capital at risk per trade (e.g., 1-2% of your total account). Then, calculate your position size using that percentage, divided by the distance to your stop-loss, multiplied by the asset's price volatility (ATR can be helpful here). This way, whether you're trading $BAC or $NFLX, the actual dollar amount you stand to lose if your stop is hit remains consistent with your defined risk, regardless of how wide your stop needs to be. It keeps you in the game longer.